Ordnance breech mechanism



A.- T. DAWSON AND G. T. BUCKHAM.

ORDNANCE BREECH MECHANISM. APPLICATION FILED JULY 10,1918

Patented July 6,1920

2 SHEETS-SHEET l.

A. T. DAWSON AND G. T. BUCKHAM.

I ORDNANCE BREECH MECHANISM. 1,345,536.

PPLICATION FILED JULY 10 1918 ,UNITED; STATES:

ARTHUR TREVOR DAWSON AND en'onen THOMAS. BUoKHArLLorswns'rmrNsrnnf LoN oN, ENGLAND, ENGLAND.'

To all who m it'mag comm; c

Be it known that we,"Sir",ARTHUR TR VOR DAwsoN, knight, and Sir GEORGE T OMAS BUCKHAM', knight, both subjects of the King of Great Britain,residing at Vickers House,

7 Broadway, Westminster, in the county of mechanism ofthe breech screw carrier London,'England, have. invented certain new and useful Improvements in or Relating to Ordnance Breech Mechanism, of which the following is a specification. 1

This invention relates to ordnance breech type having an obturator or mushroom ,(preferably of the deBan geZ? typefwhose axial vent bolt carries a; nut serving as an abut-i ment for the axial vent-spring or carr'ies a radially in the rear partof the carrierfand.

collar or washer serving as part of'the means for attaching to the gun a modified rifle look as describedin certain of; our concurrent patent applications, the nutflor'the collaror, Washer being retained, by suitable means, in position onthe axialvent bolt. H According to the invention the means for retaining thenut (or the collar or washer) in position on, theax'ial vent bolt compr1se a catchwhlch s mounted'on the carrier in an" accessible pos tion so as to permlt the said catch to be readilydisp'laced'to its disengaged position to enable the nut to be re; movejd-cfrom the bolt This 'c'atch is preferably'in the form of a locking pin mountedmay be employed. in conjunction With'a safetyshuttenfor preventing a T tube or primer frombeing prematurely inserted into its chamber in the axial" vent," in which.

event the said pin also serves to retain the shutter in positionon the carrier.

In order that the said invention may be clearly understood and'readily carried into effect we will describe the same more fully with reference to the accompanying drawings, in which I Figures 1 and 2 are'respectively a rear elevation and a plan showing the locking pin used in conjunction with the axial vent nut and the aforesaid safety shutter.

Fig. 3 is a fragmental left-hand side view' of Fig. 1.

Fig. 4 is a section taken approximately on the line 4, 4 of Fig. 2. a

Fig. 5 is a section.takenapproximately on the line 5, 5 of Fig. 1.

Fig. 6 is a VlGW similar to Fig. 4 but oRDNANcE BnEEcH M ncHANIsM'.

AssreNonsro 'vIoxE'Rs LIMITED, or. WESTMINSTER,

7 Specification of Letters Patent. 1 Patented July 6, 1920', I AppIi cation filedi July 1t), 1918. se ri al No. 24 4,33 5 i a i safety shutter. The shutter E comprisesa radial arm on a sleeve E "disposed in a rece'ss in the carrier'A around the rear part of i I v carrier; B theaxial" vent bolt and G the axial vent nut. D is the aforesaid locking pin and E is the aforesaid ATENT I the axial vent bolt and is retained in posi ion by a'p D T s p I 'i .de h y nected .to thecarrier 'and'its innerfend is disposed in a circumferential groove or slot;

E in the sleeve When the breech scre'w' is locke d, the shutterQE occupies a position as shown in Fig. 1, and itsouter end "lies clear of the bayonet joint're'ces's in therear end or h a ia e -bole a e i tabs V a primer can "then be extractedand a new j one inserted." .lNhen unlocking movem ent is? given to the breech" screw, moti on is im parted being inserted into its chamber' in thesaidbolt.

The locking pin D is slidably mounted in a radial hole in the rear part of the carrier to the sleeve E and the' shutter E is hen br ug im o s h-5a sem n thaws; inner end lies acrossthe, bayonet joint: re

c is in the end of theaxial ventib'olt and 7 thereby {prevents tube or" primer from A and at its outer end has a milled or other- J Wise suitably formed head D by which the pin can be displaced by the operator. The

inner end of the pin normally engages with a slotC' in the aforesaid nut C to retain it on the axial vent bolt and is locked in this osition by a split pin D? or otherwise.

he outward or. disengaging movement of the pin is limited by any suitable means, such as a screw A which is mounted on the car-:

rier and engages'with a groove 1) in-the- 'pin. The inner part of the'said pin passes through a segmental slot E in the sleeve E of the shutter E, this slot being of suf ficient length to permit the required move- The aforesaid screw A and the groove D in the. locking pin normally prevent the latter from being moved outward far enough to become disengaged from the said segmental slot E When it is desired to remove the safety shutter as well as the nut (J, the

screw A. is unscrewed to bring it 'clearof the groove D so as to enable the p11; to be withdrawn from the segmental slot E Fig. 9 shows a construction in which the axial vent nut is replaced by a collar or washer ,F servingfor the attachment of a modified rifle lock F. In this case the locking pin D engages with a slot in the said collar or washer and also passes through'a segmental slot in the sleeve E of the safety shutter as above described. Fig. 10 shows a construction in which both'the axial vent nut C and the collar or washer Fare employed the locking pin I) thenserving toretaiii the axial vent nut, the rifle loclr andthe safety shutter in position.

lVhat we claim and desire tosecure by Letters Patent of the United States is 1. In ordnance breech mechanism of the breech screw carrier type, the combination with the axial vent bolt or mushroom stem and its spring, of a member serving as an abutment for, one end of said spring and a displaceable catch mounted on the breeeh screw carrier for engaging with said member to, hold it in'fposition. V

2. In ordnance breech mechanism of the breech screw carrier type, the combination with the axial ventbo'lt'. or mushroom stem and its spring, of a member serving as an abutment for one end of said spring and an axially d splaceable lock ng pm engaging in a slot in said member for h ld g the lat: ter in position. v

, .3. In ordnance breech mechanism of the breech screw carrier type, the combination. with the axial vent bolt or mushroomstem and its sprmg, .of a member, serving as ,an

abutment vfo one and of s sp ng and an axially displaceable locking pin arranged radially in the breech screw carrier for engaging in a slot in said member to hold it in position. r a

4. In ordnance breech mechanism of the breech screw carrier type, the combination with the axial vent bolt or mushroom stem, its spring and the nut on said bolt serving as an abutment for one end of said spring, of

a displaceable catch mounted on the breech screw carrier for engaging with said nut to hold it in position on the bolt.

5. In ordnance breech mechanism of the :breech screw carrier type thecombination with the axial vent bolt or mushroom stem, its spring, a rifle lock and a washer serving as an attachment for said lock and as'an abutment for one end of said. spring, of a displaceable catch mounted on the breech screw carrier for engaging with said washer to hold it in position. V

,6. In ordnance breech mechanism of the breech screw carrier type, the combination with the axial vent bolt or mushroom stem, its spring, the nut on said bolt serving as an abutment for one end of said spring, a rifle lock and a washer serving as an attachment for said lock, of a displaceable catch mountd o h b eec sc w ca r e for e gag n with said nut and with said washer to hold em i Po t o V '7. In ordnance breech mechanism of the breech screw carrier type, the combination with the axial vent bolt or mushroom stem and its spring, gt a member serving as an abutmentfor one Gndfof said spring, a safety shutter for preventing a tube or primer from being inserted into its chamber in said bolt untilthe breech screw is locked, and a displaceable catch mounted on the breech screw carrier for engaging with said member and with the shutter to hold them in position.

.I te tim ny wh reof We a f our g atures ARTHUR Tan voR. DAWSON- GEORGE THOMAS BUQKHAM 

